Every year, young innovative students nationwide are honored at the White House Science Fair, given the opportunity to demonstrate their brilliantly manufactured products for President Obama as his jaw drops in awe. Needless to say, their life-changing handiwork never fails to impress POTUS. Yesterday, 100 kids, many of them not yet old enough to drive, showcased their achievements fashion from traditional materials proving that even they have the ability to solve the world’s problems. After checking out the many inspiring future Bill Nyes’ exhibits from dehydration-preventing football gear to underwater robots, here are the 7 most amazing White House Science Fair inventions we saw:

A prosthetic, fully operational arm for only $250: Easton LaChapelle, 17 of Mancos, Colorado, found a cheaper way to build a more functional limb, much cheaper than the $80,000 it’s currently on the market for. After working with robotic arms made of Legos and controlled by Nintendo gloves, Easton created most of the parts through a 3D printer and was able to create a prosthetic arm for just $250. Currently Easton is in the midst of trying to figure out how to control the hand through a headset to improve its usability for people that have limited limb mobility.

A collapsible, bicycle-powered water filtration system: Payton Karr and Kiona Elliott of Oakland Park, Florida, designed a pedal-powered emergency water-sanitation station that is both easily collapsible and transportable. It filters E. Coli among other bacteria that normally contaminate water supplies. According to the teens, their product can produce enough water to hydrate 20 to 30 people during a 15 hour period.

A device that strengthens eye muscles and improves peripheral vision by as much as 87 percent: Jessika Baral of Freemont, California developed a device to help those who experience eye muscle fatigue from staring at their screens for a long period of time. She found that regular exercise with her device helped to improve peripheral vision in children and adults by as much as 87 percent. Nothing like her device exists today.

Helping hearing-impaired people enjoy the sounds and touch of music: 15-year-old Jonah Kohn of San Diego, California built an electric guitar from scratch, designing all of the internal electronics himself just three years ago. Enjoying the building process, he decided to create a device that can help the hearing-impaired through tactile vibration. With vibrating speakers , listeners can detect vibrations of different frequencies at various points on their body in conjunction with auditory sound. More than 90 percent of subjects that tested his product said that their perception of music improved.

A robot that can easily navigate an underwater obstacle course: Chevanne Binns-Wallace from Baltimore, Maryland, a teen who suffers from sickle cell anemia, left his hospital bed to pursue his dream. Chevanne and his team built an underwater robot equipped with a propulsion system, controller, and wire circuit board. The robot can swiftly find its way through an underwater obstacle course.

A computer program that helps to improve cancer detection: Brittany Wenger, a high school senior from Sarasota, Florida, spent more than 1,000 hours researching and developing a Global Neural Network Cloud Service for Breast Cancer. The service uses “multiple data from a single less invasive procedure” to aid in improving cancer detection. Already having run 7.6 million trials and with 99.11 percent sensitivity, Brittany has gone above and beyond what’s expected of a teen her age.

An infrared photodetector that the Army endorses: Saumil Bandyopadhyay, a high school senior in Richmond, Virginia, co-holds a provisional US patent for the discovery of a novel photodetector. He was hired by the US Army to create a “frequency-selective infrared photodetector with high light-to-dark contrast ration.”